Warp stop motion for looms



.//v VENTOR ATTORNEY Aug. 10 1926. I H. A. DAVIS WARP STOP IO'I'ION FORLOUIS Y Fil ed March 16, 1926 2 sheets-sum 1 4 "n51 FF..- .1127}.-. N 0I .w I- NW Aug. 10, 1920,

v 1,595,543 H A. DAVIS HARP STOP IO'I'ION FOR LOOKS Filed March 16,,1926 2 Shuts-Shoo. 2

lA/l/[NroR ATTORNEY Patented Aug. 10, 1926.

UNITED STATES PATENT orrice.

granny DAVIS, or HOIETDALE, MAssnoHusET'rs, ASSIGNQR TO Dnnrnn 003F034.TIQN, OE HQPEDALE, MASSACHUSETTS, A conronA'rioivor MAINE.

WARP sror MOTION FOR LOOMS.

Application filed March 16, 1926. Serial No. 95,011.

This invention relates to looms and more particularly to means foreffecting loom stoppage when any one of the warp threads breaks orbecomes too slack.

It is now the common practice to provide looms with warp stop mechanismof the type wherein warp; detectors or drop wires are supported by thewarp threads and are normally held thereby out of the path of avibrating feeler, and when a warp thread breaks or becomes too slack,the movement of the feeler is arrested to effect loom stoppage.

The mechanism now commonly provided to stop the loom when the rockingmovement of the feeler is arrested by a drop wire, con sists of apivoted dog that is mounted upon a movable carrier and the dog isconstructed to be moved into position to engage a traveling hunter whenthe loom is to be stopped. The means employed heretofore for placing thedog under the control of the 'feeler usually consists of a plunger thatabuts against the dog to lift it, and an actuator for shift-- ing theplunger.

"This mechanism employed heretofore for shifting :the dog is open to theohjectionthat the angle through which the dog moves will vary with themovement imparted to the dog operating plunger, with the result that theoperating movement imparted to the plunger does not always properlyposition the dog. I i

To overcome this diiiiculty, the presentinvention relates to meanscontrolled by the warp stop mechanism and which is so construct-ed thatthe dog which engages the hunter is shifted'to the same positionirrespective of the amount of movement imparted to the-dog actuatingmeans, and as. a result, proper positioning of the dogupon theoccurrence of a warp fault is assured,

The invention and the variousnovel features thereof will bestbe madeclear from the following description and the -accompa-nying drawings ofone good form thereof.

In the drawings v Fig. 1 is a side view of a loom with parts in section,and containing the present invention; 7

Fig. 2 on an enlarged scale is a perspective view of the dog carrier andas sociated parts;

Fig. 3 is a longitudinal sectional view through the carrier of Fig. 2,showing the dog in its inactive position;

Fig. .i is a view similar to that of Fig. 3 but showing the dog in itsactive position; and I r Fig, 5 is a perspective view ofthe warp stopmechanism and controller associated with the feeler,

The loom frame 1 may be of usual-com structionand is provided with thelay 2 supported, by the lay swords 3.; Mounted onthe loom frame is theshipper t which, when the loom is in operative condition, is retained,as usual, in a notch 5 on the shipper stand. Pivotally mounted on theloom frame at 6 is a shipperlinock-off 7, the end 8 of which normallyrests against the front portion of the shipper 1 and is adaptedtodisengage it from. its holding notch 5 to effect loom stoppage, I

The warp stop mechanism may be of any usual type and as shown comprisesthe side bars -9 eXtendi -ig transversely of the loom and upon which thewarp threads or, rest, Each of the warp threads at supports a drop wire10, and so far as the inventionin the present case is concerned, suchdrop wires may be of any usual type,

The side bars 9 are supported by brackets 11 mounted atthe oppositesides of the loom and these brackets are provided with a downwardlyextended portion 12 in which the rock shaft 13 is pivotally mounted.Rigidly secured to this shaft are the arms 14 which support and rock thefeeler 15 in a well-known manner, The means shown for rocking the shaft13 consists of the cam member 7.16 rigidly secured to the shaft andwhich engages a complementary cam member or controller 17 looselymounted on the rock-shaft and actuated to efi"ect' rocking' movement ofthe rock-shaft by means'of an arm 18 which may be rocked by a rod19, asusual in this type of warp stop mecha-. nism. Between the sleeve of oneof the arms 14 and the cam member 17 is confined a spring 20, theconstruction being such that during normal operation of the loom, thefeeler, 15 will be given a rocking move: ment below the drop wires 10,but onthe occurrence of a warp fault, as when a warp threadbecomesbrolren or too slack, the supported drop wire 10 will fall intothe path of the feeler 15 and stop the rocking-shaft, whereupon thecontroller .17 will be moved longitudinally of the rock shaft,

This movementof the controller 17 longis tudinally of the rock-shaft, inthe construction shown, serves to impart a sliding movement to a.flexible wire 21 within the flexible sheath 22. One end of the sheath 22is secured to the bracket 12 and an end of the wire 21 rests against thecontroller 17 The arrangement is such that movement of the wire 21within the sheath 22 serves to shift a dog into position to effect loomstoppage by releasing the shipper 4, as will presently appear.

In the construction shown, the shipper knock-off 7 is controlled by arod 23 that extends from the knock-off to a dog carrier 24. This carrieris mounted for sliding movement to effect loom stoppage, and may besupported by a bracket 25 to which it is adjustably secured by aclamping bolt 26 that extends through an elongated slot 27 in thebracket. The bracket 25 may be slidably mounted upon the brake applyingrod 28, that is, supported at one side of the loom.

Within the carrier 24 is pivotally mounted the dog 29 having the pivotpin 30, and the parts are so positioned that when the dog 29 is rockedto the position shown in Figs. 1 and 4, it will be struck by a bunter 31secured to the lay 2.' The arrangement is such that engagement of thebunter 31 with the dog will force the carrier 24 in a left-handdirection, view Fig. 1, and this will pull the rod 23 to release theshipper 4.

The construction described whereby loom stoppage is effected by moving adog into position to be engaged by a traveling bunter is old, but asabove stated, the mechanism employed heretofore for moving the dog toits bunter engaging position has been open to the objection that itwould not accurately shift the dog to the desired position, because themovement imparted to the dog would vary heretofore with the amount ofmovement imparted to the dog actuating means.

In order to overcome this difficulty, the present invention is directedto dog operat ing means which is so constructed that variation in theamount of movement imparted to the dog actuating means will not vary theposition to which the dog is shifted, and to this end the carrier 24 isprovided with a slide 32, shown as positioned below the dog andsupported for sliding movement by the bar 33 to which it is rigidlysecured and the ends of which bar are received in aligned holes in thecarrier. The slide 32 is provided with a cam portion 34 positioned toengage a shoulder 35 upon the dog. The arrangement is such that as theslide 32 is shifted from the position shown in Fig. 3 to that of Fig. 4,it will move the dog to its operative position of Fig. 4, and it isimportant to note that as the cam portion 34 wipes under the shoulder35, it will lift the dog a predetermined amount, irrespective of slightvariations in the amount of sliding movement that may be imparted to theslide. The portion of the shoulder 34 which rests upon the cam when theparts are in the position shown in Fig. 4 should lie approximatelyparallel to the axis of the bar 33, as shown, so that the cam 34 maymove a substantial distance along the dog with out changing the positionin which the lat- A ter is supported.

the slide 32 serves accurately to positionthe dog 29 and that minorvariations in the amount of movement imparted to the slide will not varythe position to which the dog is shifted because the lower surface ofthe shoulder 35, while approximately parallel to the axis of bar 33 asstated, has a sufficient inclination downwardly towards the end of thedog to compensate for the variation in distance of the cam 34 from theaxis 30 of the dog, but such inclination is, of course, slight.

What is claimed is 1. In a loom, the combination of warp stop mechanism,a controller adapted to be moved on the occurrence of a warp fault, adog carrier mounted for movement to and from a position to effect loomstoppage, a dog pivotally mounted upon said carrier for movement intoand out of position to be struck by a traveling bunter, a slide mountedupon the carrier for sliding movement in a direction longitudinally ofthe dog and having a cam portion to engage the dog to rock the same toits bunter engaging position, as the slide moves longitudinally of thedog, and means actuated by the controller for moving the slide to thedog actuating position. i i

2. In a loom, the combination of warp stop mechanism, a controlleradapted to be moved on the occurrence of a warp fault, a dog carriermounted for movement to and from a position to effect loom stoppage, adog mounted upon said carrier for movement into and out of position tobe'struck by a'bunter and having a shoulder, a slide mounted upon thecarrier for sliding movement in a direction substantially parallel tothe dog and having a cam portion positioned to move along said shoulderand thereby lift the dog to its operative position, and a plungeractuated by the controller for moving the slide to the dog liftingposition.

3. In a loom, the combination of warp stop mechanism, a controlleradapted to be moved on the occurrence of a warp fault, a

dog carrier mounted for movement to and from a position to effect loomstoppage, a

dog pivotally mounted upon said carrier for movement into and out ofposition to be actuated by a hunter, a slide mounted upon the carrierfor movement along a predetermined path relatively to the dog andinterengaging parts on the dog and slide con structed and arranged sothat movement of the slide to difierent positions along said path willimpart the same rocking movement to the dog, and means actuated by thecontroller for moving the slide.

4:. In a loom, the combination of a Warp stop mechanism, a controlleradapted to be moved on the occurrence of a Warp fault, a dogcarriermounted for movement to effect loom stoppage, a dog pivotallymounted upon said carrier for movement into and out of position to beactuated by a hunter, a slide mounted upon the carrier and engagingparts on the slide and dog constructed and arranged to lift the dog thesame amount irrespective of the length of movement imparted to theslide, and means actuated by the controller for shifting the slide.

5. In a loom, the combination of Warp stop mechanism, a controlleradapted to be moved on the occurrence of a Warp fault,

a dog carrier mounted for movement to effect loom stoppage, a dogpivotally mounted upon said carrler for movement into and out ofposition to be actuated by a hunter and having a shoulder, a slidemounted upon the carrier and having a cam portion positioned to engagesaid shoulder to lift the dog to a predetermined position. and then movepast the shoulder Without imparting further movement to the dog, andmeans actuated by the controller for moving the slide.

6. In a loom, the combination of Warp stop mechanism, a controlleradapted to be moved on the occurrence of a Warp fault, a dog carriermounted for movement to effect loom stoppage, a dog mounted upon saidcarrier for movement into and out of position to be actuated by abunter,a slide mounted upon the carrier for movement in a directionlongitudinally of the dog and constructed and arranged to shift the dogto the same position irrespective of the amount of movement imparted tothe slide, a plunger for shifting the slide, and means actuated by thecontroller for operating the plunger.

In testimony whereof, I have signed my name to this specification.

HARRY A. DAVIS.

